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Buderus Products Floor standing condensing boilers GB312


The GB312 is available in the following kW outputs:
  • 90kW
  • 120kW
  • 160kW
  • 200kW
  • 240kW
  • 280kW

Features and benefits

  • High efficiencies of up to 108% (NCV)
  • Seasonal efficiency (L2B) 90kW 96.3%, 120kW 96.2%, 160kW 96.4%, 200kW 96.2%, 240kW 96.1%, 280kW 95.8%
  • Quick and simple to install
  • Individual boiler outputs from 90 - 280kW
  • Cascade of two boilers up to 560kW
  • Excellent price/performance ratio
  • Modulating pre-mix gas burner for extremely quiet operation
  • Lightweight, high performance aluminium heat exchanger for maximum heat transfer
  • Insulated boiler block for high energy utilisation
  • Intelligent controls with built-in Energy Management System (EMS)
  • Supplied with the BC10 boiler control with digital service diagnostic and status display with space for the optional RC30 Digital Programmer and modules to be installed within the boiler
  • Burner management technology
  • Lightweight and compact to fit into existing boiler rooms
  • Suitable for room sealed installations
  • Simple to service and maintain

Servicing and maintenance

The GB312 is designed to make servicing and maintenance as straightforward as possible.

All parts can be accessed from the front and the burners can be accessed without having to disturb the gas connection.

The boiler is equipped with SAFe digital ignition technology and a Buderus Energy Management System (EMS).

Performance and design

The GB312 is a high performance, compact condensing boiler which provides an efficiency of up to 108% (NVC).

It can be fitted individually or as part of a 2 boiler cascade kit and is especially well suited to medium-large buildings and office blocks.

For a powerful floor standing condensing boiler it is very compact, lightweight and easy to install.

The boiler is whisper quiet, even when running at full output.

Boiler and system controls

Technical dataFile typeFile sizeDownload
Tech data sheet GB312 PDF 192
CAD drawingsDWG33 to 38KB
Floor standing boilers
Hydraulic schematicsJPEG
GB boilers
Wiring schematic drawings - 4000 seriesJPEG
4122 Control schematics
4323 Control schematics
4121 Control schematics
Wiring schematic drawings - EM10JPEG
EM10 Control schematics
Wiring schematic drawings - MCM10JPEG
MCM10 Control schematics
Wiring schematic drawings - RC35JPEG
RC35 Control schematics

Manual downloads

Manual type  File type   
GB312 installation manual for contractors PDF Download (PDF 5.0 MB)
GB312 Operating manual PDF Download (PDF 0.7 MB)
GB312 Overview brochure PDF Download (PDF 1.4 MB)
GB312 - 90 ErP fiche PDF Download (PDF 0.1 MB)
GB312 - 120 ErP fiche PDF Download (PDF 0.1 MB)
GB312 - 160 ErP fiche PDF Download (PDF 0.1 MB)
GB312 - 200 ErP fiche PDF Download (PDF 0.1 MB)
GB312 - 240 ErP fiche PDF Download (PDF 0.1 MB)
GB312 - 280 ErP fiche PDF Download (PDF 0.1 MB)
Enhanced Capital Allowance Scheme (ECA)